<!DOCTYPE HTML>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>返回值函数</title>
  <script type="text/javascript">
    function app2(x, y) {
      var sum, x, y;
      sum = x * y;
      return sum
    }
    var req1 = app2(5, 6)
    var req2 = app2(2, 3)
    var sum1 = req1 + req2;
    document.write("req1的值:" + req1 + "<br/>");
    document.write("req2的值:" + req2 + "<br/>");
    document.write(req1 + "与" + req2 + "和:" + sumq);
  </script>
</head>

<body>
</body>

</html>